You can change it yourself! If you want to replace the whole leather pad, you need special disassembly tools, and you need to remember the installation sequence, the linkage of the key lever and so on. And you need to adjust the keys of the link to be in harmony with others (for example, the keys are moderately elastic and feel comfortable when forced). There are videos and words on the internet to discuss the method of replacing the leather pad. But I want to remind all my friends that leather pads are prone to aging at high temperatures. As long as the replaced leather pad does not leak, don't deliberately make an indentation. The more times the keycap is heated, the shorter the life of the mat. If you can use natural restoration, try to bake leather mats as little as possible.